so ive had the same issue, either with a sds100 or a HP2, while mobile in the car, with either picking up pretty clear somedays, or they pick up nothing most days, or it will briefly pick it something up, and for short time and is so broken/choppy, cant unerstand it. for the most part its radio silence when im in the car, and this is with or without a mag mount antenna. i've tried both ways. my local system is not simulcast, just P25 Phase 1. so not sure why i have the issues recieveing things like i do, works fine at home. do i need a better mag antenna or what, it just got to the pint where its pointless bringing it with me, if its not going to pick up good, or nothing at all. should i look at getting a base/mobile scanner, like a 996p2 and stick under a seat? need some help, thanks.